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Hello all, I have a Viking Legend spa that was manufactured in early 2014. After changing the water, the main pump has begun to pulse and surge when the high jet is turned on. It seems to run fine in low, normal circulation mode. (The second pump seems to be running without issue.) The spa was not run without water covering all the intakes, but it was run without the filter so I could perform a deep cleaning with Spa Purge. Turning the power off and allowing the pump to re-prime did not fix it. Does this sound like an air pocket issue? If so, how do I correct it? I'm a novice, but ha